# Gens Ace vs CastleLink2

The clearest difference is rating: CastleLink2 at 5.0 against Gens Ace's 3.0. Gens Ace's advantage is iOS requirement (13.0 vs 26.0). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

CastleLink2 holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 5 and 2 respectively.

Gens Ace ships an update every 3 weeks, CastleLink2 monthly. The most recent releases landed on September 11, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Gens Ace | CastleLink2 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (5 ratings)](https://appshunter.io/ios/app/gens-ace/id6683295995/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/castlelink2/id6743709203/reviews)** |
| Number of ratings | **5** | 2 |
| Positive reviews | 40.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Free | Free |
| Size | 23 MB | 35 MB |
| Requires iOS | **13.0** | 26.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Grepow Battery Co.Ltd.](https://appshunter.io/developer/1714028930) | [Castle Creations Inc](https://appshunter.io/developer/1377811229) |

## What reviewers say

### Gens Ace

[App page](https://appshunter.io/ios/app/gens-ace/id6683295995)

Monitor your RC charger and battery status in real-time via Bluetooth. Track charging and discharging progress directly from your iPhone or iPad. Designed for hobbyists and professional racers seeking a safer and smarter power experience.

**Highlights:** Real-time status monitoring, Bluetooth connectivity, Charge and discharge tracking, iPhone and iPad support, Smart power solutions

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### CastleLink2

[App page](https://appshunter.io/ios/app/castlelink2/id6743709203)

Connect to Castle Creations ESCs and BECs via Bluetooth to adjust settings, update firmware, and view data logs. Compatible with a wide range of ESCs and BECs, supporting both B-Link hardware versions.

**Highlights:** Connect to Castle Creations ESCs/BECs, Adjust settings, Update firmware, View data logs, Supports B-Link adapters, Wide ESC/BEC compatibility

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Gens Ace free?

Gens Ace is free to download, with no in-app purchases.

### Is CastleLink2 free?

CastleLink2 is free to download, with no in-app purchases.

### Which has better reviews, Gens Ace or CastleLink2?

CastleLink2 is rated higher. Gens Ace averages 3.0 out of 5 from 5 ratings, while CastleLink2 averages 5.0 from 2 ratings.

### Do Gens Ace or CastleLink2 have ads?

Neither Gens Ace nor CastleLink2 shows ads.

### Which is updated more often, Gens Ace or CastleLink2?

Gens Ace ships an update every 3 weeks, and CastleLink2 monthly. Most recently, Gens Ace was updated on September 11, 2026 and CastleLink2 on September 8, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*